It appears that this event occurred at the Oregon Women's Correctional Center during October 1988. Both a hunger strike and sit-in occurred to draw attention to the problems the prisoners were facing, including over-crowding, educational discrimination, and more. According to a newspaper account (see citation below), the Oregon chapter of the ACLU was interested in investigating the prisoners' claims. Perhaps they could also be of assistance to you. Their contact information is:

Here is the citation for the article I located on the sit-in: Ames, Sarah B. "Protests put Women's Prison in Spotlight" Oregonian October 31, 1988, pB2.

The article also notes that the Task Force on Corrections Planning issued a report in the summer of 1988 that indicated there was discrimination present in educational and work programs, namely that women did not have equal opportunity. I believe the report to which the article refers is this one:

Some time in the 1980s, women incarcerated in Oregon staged a sit-down demonstration to protest the fact that higher education was available to male prisoners but not female prisoners. As a result of the demonstration, 10 women prisoners were allowed to participate in college courses that had previously only been open to men at Oregon STate Prison.

How would I find media coverage/more information about this demonstration and its results?